期刊
CATALYSTS
卷 7, 期 10, 页码 -出版社
MDPI AG
DOI: 10.3390/catal7100284
关键词
coordination polymerization; neodymium catalyst; polyconjugated dienes; stereoblock polymer; rubber
Butadiene polymerization, in both a highly cis- and trans-specific manner, was achieved by using a Cp*Nd(BH4)(2)(thf)(2)-Bu2Mg system as an initiator. The cis-/trans- ratio can be tuned by the amount of trialkylaluminum-depleted modified methylaluminoxane (dMMAO). The cis-regularity of the polymer was much higher than those obtained by Nd(BH4)(3)(thf)(3). The molecular weight of cis-regular polymer was increased according to polymer yield, showing that there was no termination or chain transfer reaction during the polymerization. Synthesis of stereodiblock polybutadiene, which showed a high melting temperature (T-m) compared with stereodiblock polyisoprene, was also performed by the addition dMMAO during the polymerization.
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